hpts: install kernel module

It is important to instantly load tcp_rack.ko and tcp_bbr.ko

Reviewed by:		tuexen, imp
Differential Revision:	https://reviews.freebsd.org/D42697

sys/modules/tcp/Makefile

@@ -1,15 +1,13 @@
-#
-#
-
 .include <kmod.opts.mk>
 
-SUBDIR=	\
+SUBDIR=	${_hpts} \
         ${_tcp_bbr} \
         ${_tcp_rack} \
 	${_tcpmd5} \
 
 .if (${MK_INET_SUPPORT} != "no" || ${MK_INET6_SUPPORT} != "no") || \
 	defined(ALL_MODULES)
+_hpts=		hpts
 _tcp_bbr= 	bbr
 _tcp_rack= 	rack
 .if ${KERN_OPTS:MIPSEC_SUPPORT} && !${KERN_OPTS:MTCP_SIGNATURE}

sys/modules/tcp/hpts/Makefile

@@ -0,0 +1,6 @@
+.PATH: ${SRCTOP}/sys/netinet
+
+KMOD=   tcphpts
+SRCS=   tcp_hpts.c opt_inet.h opt_inet6.h opt_rss.h device_if.h bus_if.h
+
+.include <bsd.kmod.mk>